JPH11170267A - Production of mold for molding tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a mold for molding a tire by a method in which even when the design of the tire is complex, a gypsum casting mold can be separated from a rubber mold without hurting the gypsum casting mold and without lowering production efficiency, workability, and dimensional accuracy. SOLUTION: In a mold producing method for molding a tire by a gypsum casting method, in a process for preparing a gypsum casting mold by casting gypsum 14 into a rubber mold 13, in a part of the gypsum casting mold sandwiched between projections 36 formed in the rubber mold 13 corresponding to the grooves of the tire, a plate-shaped, pin-shaped, or corrugated plate-shaped reinforcing material 35 is embedded nearly in parallel with the projections 36 and to be deeper than the projections 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a tire mold made of an aluminum alloy.

[0002]

2. Description of the Related Art There are two types of tire molding dies, an upper and lower integrated type and an upper and lower split type.
As shown in FIG. 4, each block 2 has a molding space 3 corresponding to the shape of the tire when it is divided into 7 to 10 on the circumference thereof. Each block 2 has a molding space 3 corresponding to the shape when the tire is cut in a circle at the center line of the peripheral surface. The molding of the tire is performed by pressing this mold against an uncured (unvulcanized) rubber material called a green tire and heating and curing it.

[0003] Such a tire molding die is generally used.
Manufactured by gypsum casting based on a master model corresponding to the minimum angles required to construct a tire design over 360 °. That is, as shown in FIG. 16A, first, a rubber mold 13 is produced using the master model 44 as a mold, and then, as shown in FIG. 16B, the plaster 14 is poured into the rubber mold 13 and solidified. By doing so, a required number of plaster molds are produced. Finally, as shown in FIG. 16 (c), the plaster mold 4 is combined into a tire shape,
The periphery is surrounded by an annular casting frame 5, and a molten metal 6 of an aluminum alloy is poured between the gypsum mold 4 and the casting frame 5 and cast to obtain a mold.

On the other hand, a tire is generally provided with a groove called a rib 9 running in a circumferential direction and a groove called a lug 10 running in a width direction, as shown in FIG. Further, a fine groove called a sipe 11 is provided. Therefore, a projection corresponding to each groove is formed in the tire molding die, but a projection (fine bone) corresponding to a fine groove such as a sipe becomes thin. However, usually, a die is used in which a fine plate having a predetermined shape is embedded by cutting or press bending a ferrous plate material such as stainless steel.

[0005] The manufacture of a tire molding die having such a fine bone is performed as follows. First, FIG.
As shown in (a), the casting allowance 45 of the fine bone 12 into the mold is provided.
Model 44 provided at a position where a sipe is to be formed
, And a rubber mold 13 is manufactured using this. next,
As shown in FIG. 18B, the portion of the fine bone 12 to be embedded in the mold body is inserted into the groove formed in the rubber mold 13 by the cast-in allowance 45, and the fine bone 12 is set. Next, FIG.
As shown in FIG. 8C, the portion of the fine bone 12 exposed from the rubber mold is cast into the gypsum 14 and released from the rubber mold 13 to produce the gypsum mold 4 shown in FIG. . Next, as shown in FIG.
A molten metal 6 of an aluminum alloy is poured into the mold and cast to obtain a mold 1 having fine ribs 12 shown in FIG.

[0006]

However, due to the recent complication of tire design and studless design,
As shown in FIG. 19, when the gypsum mold 4 is released from the rubber mold 13, there is a problem that the gypsum mold 4 is broken in a portion surrounded by ribs, lugs, and sipes in a block shape.

[0007] Such a defect in the gypsum mold is closely related to a large amount of undercut when the gypsum mold is released from the mold, and a difficulty in the flow of the outside air into the block formed by the ribs, lugs, and sipes. Generally, the deeper the ribs, lugs and sipes, the larger the angle of the master model, and the harder the rubber material of the rubber mold, the more likely it is to occur.

[0008] Therefore, conventionally, as a measure against the loss of the plaster mold, a defective portion of the gypsum mold is repaired later, a gypsum mold is formed using a gypsum material having high strength, and the angle of the master model is reduced. In addition, a method of using a rubber having a small hardness as a rubber used for manufacturing a rubber mold has been adopted.

However, a method of repairing a defective portion of a gypsum mold later requires extra man-hours, and in many cases, complete repair is difficult depending on the design of a tire. There is a problem that the chip may be damaged again by thermal shock.

Further, in the method of increasing the strength of the gypsum material, there is a problem that the mold release resistance increases due to the decrease in air permeability in the block as the strength increases, and it becomes difficult to remove the mold.

In addition, in the method of reducing the angle of the master model, the number of steps required for manufacturing and assembling the gypsum mold is unnecessarily increased, so that there is a problem that the production efficiency and the work efficiency are reduced.

Further, the method using a rubber having a small hardness has a problem that the dimensional accuracy of the rubber mold is reduced.

The present invention has been made in view of such circumstances, and an object of the present invention is to remove a gypsum mold from a rubber mold even when a design provided on a tire is complicated. It is another object of the present invention to provide a method of manufacturing a tire molding die that does not cause a defect in a gypsum mold and does not reduce production efficiency, work efficiency, and dimensional accuracy.

[0014]

Means for Solving the Problems According to the present invention, there is provided a method for producing a tire molding die by a gypsum casting method, wherein the step of pouring gypsum into a rubber mold to produce a gypsum mold includes the steps of: A plate-shaped, pin-shaped or corrugated reinforcing material is buried in a portion of the gypsum mold sandwiched between the protrusions provided in the rubber mold corresponding to the grooves, substantially parallel to the protrusions and deeper than the protrusions. A method for manufacturing a tire molding die is provided.

[0015] In the above method, one end of the reinforcing material is embedded in a rubber mold in a state where a portion of the reinforcing material embedded in the gypsum mold is exposed, and after the plaster is poured into the rubber mold and solidified, The rubber mold and the reinforcing material may be removed, and the holes formed by the reinforcing material may be filled by pouring gypsum to prepare a gypsum mold.

Further, in the above method, one end of the reinforcing material is embedded in a rubber mold in a state where a portion of the reinforcing material embedded in the gypsum mold is exposed, and the plaster is poured into the rubber mold and solidified. Remove the rubber mold only to make a plaster mold,
After casting by casting a molten aluminum alloy into the gypsum mold, the hole formed by the portion of the reinforcing material exposed from the gypsum mold may be filled by welding. In this case, a pin-shaped member attached to one end of the pin-shaped reinforcing material or one end of the plate-shaped reinforcing material is embedded in a rubber mold, and a hole formed by a portion of the reinforcing material exposed from the gypsum mold is provided for vent hole installation. Guide hole.

Further, in the above method, a reinforcing material is attached to a portion of the fine bone for forming the sipe, which is exposed from the rubber mold, and plaster is poured into the rubber mold to prepare a gypsum mold. After casting by casting a molten aluminum alloy, the reinforcing material may be removed from the fine bone. In this case, the reinforcing material may be attached to the fine bone by bonding. In this case, the reinforcing material has a U-shape or a U-shape, and one end thereof is attached to the fine bone, and the other end has the fine bone near the other end, and is sandwiched between the projections. A portion different from the portion of the plaster mold may be reinforced.

In the above method for manufacturing a tire molding die, it is preferable that the depth at which the reinforcing material is cast into the gypsum mold is 1.5 to 5 times the length of the projection. In addition, among the above methods, when a gypsum mold is used while the reinforcing material is cast, the reinforcing material in the form of a plate or a corrugated sheet is placed in a portion to be cast into the gypsum mold by one or two or more. It is preferable to have one or two or more slits on a side having a through hole or oriented parallel to a projection provided on a rubber mold. Similarly, it is preferable that the pin-shaped reinforcing material has at least one portion having a diameter larger than that of the other portion in the portion cast into the gypsum mold.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a mold for molding a tire is manufactured by a gypsum casting method. As shown in FIG. 1, in a process of casting a gypsum 14 into a rubber mold 13 to prepare a gypsum mold. A plate-like, pin-like, or corrugated reinforcing material 35 is provided on a portion of the gypsum 14 sandwiched between protrusions 36 provided in a rubber mold corresponding to grooves such as ribs, lugs, and the like, in substantially parallel with the protrusions 36. It is buried deeper than the protrusion 36. Therefore, since the portion of the gypsum mold which is sandwiched by the protrusions 36 provided on the rubber mold 13 and is easily broken at the time of mold release is reinforced by the reinforcing material 35, the gypsum mold can be manufactured without causing any breakage. Further, the production efficiency, work efficiency and dimensional accuracy are not reduced.

Here, as the reinforcing material, it is necessary to use a material that exceeds the Young's modulus and (breaking) strength of the gypsum material. Specifically, a metal material such as an iron-based, copper-based, or aluminum-based material is used. Used. Also, the depth of embedding the reinforcement is
It is necessary to be deeper than the depth of the ribs, lugs, etc. formed on the tire, but it is preferably 1.5 to 5 times the depth of the ribs, lugs, etc.

[0021] The embedding of the reinforcing material in the gypsum mold is specifically performed as follows. First, as shown in FIG. 2A, a groove or a hole 37 for installing the reinforcing material 35 is provided in a portion of the rubber mold 13 where the reinforcing material 35 is to be embedded, and is embedded in the gypsum 14 there. The reinforcing material 35 is installed with the part to be exposed exposed. Next, as shown in FIG.
After the gypsum slurry 14 is poured into the rubber mold 13 and cured, the mold is released.

In the above case, as shown in FIG. 2C, prior to casting with a molten aluminum alloy, the reinforcing material 35 is removed from the gypsum mold 4, and the gypsum is formed in the hole 37 formed by the reinforcing material 35. After casting the cast aluminum alloy into the gypsum mold 4 without removing the reinforcing material 35, as shown in FIG. 2D, the gypsum mold 4 of the reinforcing material 35 The hole 38 caused by the exposed portion may be filled by welding. However, when the hole 38 is to be filled by welding after casting, the weld overlay and extra finish are applied to a narrow space surrounded by protrusions 40 provided corresponding to the tire grooves such as ribs and lugs. Must be done. On the other hand, as shown in FIG. 3, a pin-shaped reinforcing member 35 is used, or a pin-shaped member 41 attached to one end of a plate-shaped reinforcing member 35 is
In the case where a gypsum mold is produced by embedding in 3 and casting is performed without removing a reinforcing material from the gypsum mold, the hole formed in the mold may be used as a guide hole for setting a vent hole. As a result, a welding step is not required.
In this case, it is necessary to make the diameter of the pin-shaped portion the same as the diameter of the vent hole.
Further, the material of the pin-shaped reinforcing material or the pin-shaped member attached to the reinforcing material is preferably an iron-based material that is difficult to fuse with the aluminum alloy at the time of casting, and the shape is convenient for pulling out from the mold. Considering this, it is preferable to use a parallel pin or a taper pin having no undercut shape as shown in FIG.

Further, in the method of the present invention, FIG.
As shown in (a), a fine bone 12 for forming a sipe is formed.
The plaster 14 is poured into the rubber mold 13 with the reinforcing member 35 attached to the portion exposed from the rubber mold 13 to obtain a structure shown in FIG.
A plaster mold 4 as shown in FIG.
As shown in (c), after casting the molten aluminum alloy into the gypsum mold 4, casting the reinforcing material 35 into the fine bone 1
2 may be removed. In this case, since the reinforcing material 35 is completely buried inside the gypsum mold 4, the gypsum mold 4
Alternatively, there is no need to perform correction and finishing of the mold 1, and it is possible to improve production efficiency. In addition, the reinforcing material 3 to the fine bone 12
5 may be attached by adhesion, and as an adhesive, drying of the gypsum mold before casting (180 to 200
° C), and preferably does not react with the molten aluminum alloy during casting. Specifically, a cyanoacrylate-based instant adhesive is preferably used. As a reinforcing material, as shown in FIG. 6, one member may be used as the reinforcing material 35 by joining two members for fine bones at different positions. Further, as shown in FIG. 7, a method of integrally producing the reinforcing material 35 and the fine bone 12 in advance is also conceivable. However,
In this case, the reinforcing material 35 must be cut off from the fine bone 12 after the mold is manufactured, and the fine bone 12 must be finished.

When the reinforcing member 35 is attached to the fine bone 12, as shown in FIG. 8, the reinforcing member 35 has a U-shape or a U-shape, and one end of the reinforcing member 35 is attached to the fine bone 12. In the vicinity of the end, a portion of the gypsum mold different from the portion of the gypsum mold 4 to which one end attached to the fine bone 12 of the reinforcing material 35 reinforces may be reinforced. That is, even if there is no fine bone in a portion of the gypsum mold to be strengthened, if the fine bone exists in the vicinity thereof, the gypsum mold can be reinforced by using the fine bone as a scaffold. In addition, when there is no fine bone in the portion of the gypsum mold to be reinforced and in the vicinity thereof, the above-described method of installing a reinforcing material using the guide hole for installing the vent hole is effective.

In the method of the present invention, when the gypsum mold is used while the reinforcing material is buried, in order to prevent the reinforcing material from detaching from the gypsum mold, as shown in FIG. One or two or more through holes 33 are provided in a portion of the plate-like reinforcing material 35 buried in the gypsum mold 4, or one or two or more slits 30 are provided in a side oriented parallel to a projection provided in a rubber mold. Is preferably provided. Also, in the case of a pin-shaped reinforcing material, similarly, the portion embedded in the gypsum mold has a structure shown in FIG.
As shown by 0, it is preferable to provide one or more portions 42 having a smaller diameter than the other portions.

[0026]

EXAMPLES Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

EXAMPLE 1 As shown in FIG. 11, gypsum was used to manufacture a mold for molding a tire having a design in which a block 43 having a sipe 11 surrounded by ribs and lugs was continuous. A mold was made. The dimensions of each block formed on the tire are 20 mm long, 24 mm wide, and 21 mm high, and the sipe depth is 16 mm.

First, fine bones for forming a sipe were attached to a rubber mold, and then gypsum was poured. After the gypsum was solidified, the gypsum mold was released from the rubber mold. As shown in FIG. 5, a reinforcing material was adhered to the fine bone set in the rubber mold with an instant adhesive. As reinforcement material, length 35mm, width 5mm,
The one made of SUS304 having a thickness of 0.7 mm was used.

The rubber mold was a rubber mold with a backup material made of non-foamed gypsum, and the rubber layer thickness was 10 mm at the minimum. The material of the rubber mold is FMC201 manufactured by Smoothon
(Polysulfide rubber). As the plaster for the plaster mold, Noritake Co., Ltd., G
Using -16 foamed gypsum, 70 parts of water was added to 100 parts of gypsum, and the mixture was stirred at a foaming increase of 50 ± 5% by volume to prepare.
The compressive strength of the raw gypsum mold was 10 to 12 kgf / cm ² .

The rate of occurrence of defects when the gypsum mold was released from the rubber mold was 1 out of 10 times.

Example 2 A gypsum mold was prepared in the same manner as in Example 1 except that a reinforcing member provided with a slit as shown in FIG. 9 was used. The occurrence rate of defects when the gypsum mold was released from the rubber mold was 0 out of 10 times.

Example 3 1.5 mm in diameter and 45 in length
A gypsum mold was produced in the same manner as in Example 1 except that a mm-mm piano wire was used as a pin-shaped reinforcing material, and was set in a rubber mold portion corresponding to a vent hole forming position of the mold.
The depth of the reinforcing material implanted in the rubber mold was 5 mm.
The occurrence rate of defects when the gypsum mold was released from the rubber mold was 3 out of 10 times.

Example 4 As shown in FIG. 10, a gypsum mold was prepared in the same manner as in Example 3 except that small-diameter portions were provided every 5 mm in the length direction of the piano wire. . The defect occurrence rate when the gypsum mold is released from the rubber mold is 1
One out of zero.

Fifth Embodiment As shown in FIG. 12, a substantially square block A43a surrounded by ribs and lugs and having a sipe and a rectangular block B43 adjacent thereto are provided.
A plaster mold was made to produce a mold for molding a tire having a design consisting of a pattern consisting of b. The size of the block A43a is 23 mm long and 25 m wide
m, height 21 mm, sipe depth 16 mm, size of block B43b is 4 mm long, 60 mm wide, 1 height
3 mm.

First, a fine bone for forming a sipe of the block A is attached to a rubber mold, and
As shown in FIGS. 13A and 13B or FIGS. 13C and 13D, an L-shaped reinforcing member 35 was attached with an instant adhesive to reinforce both the blocks A43a and B43b. Note that a through hole 33 was provided in the reinforcing member 35. Next, gypsum was poured in, and after the gypsum was solidified, the gypsum mold was released from the rubber mold. Other points such as the rubber mold and the material of the plaster mold were the same as those in Example 1. The occurrence rate of defects when the gypsum mold was released from the rubber mold was 0 out of 10 times.

Comparative Example 1 A gypsum mold was prepared in the same manner as in Example 1 except that no reinforcing material was provided. The defect occurrence rate when the gypsum mold is released from the rubber mold is 9 out of 10 times.
It was times.

Comparative Example 2 A plaster mold was prepared in the same manner as in Example 5, except that no reinforcing material was provided. When the gypsum mold was released from the rubber mold, the defect occurrence rate of the block B was 10 out of 10 times.

(Comparative Example 3) Gypsum was prepared using gypsum 100
A gypsum mold was prepared in the same manner as in Comparative Example 1, except that 60 parts of water was added to each part, and stirring was carried out at a foaming increase of 20 ± 5% by volume. In this case, the compressive strength of the gypsum green mold is 20 to 25 kgf / cm ² , which means that the gypsum material has been strengthened. The occurrence rate of defects when the gypsum mold was released from the rubber mold was 8 out of 10 times.

Comparative Example 4 Gypsum was prepared using gypsum 100
60 parts of water was added to each part, and the foaming was increased by stirring at 20 ± 5% by volume and the rubber material was prepared using FMC201 diluted with 30 parts of silicone oil to obtain a Shore A hardness of 10 to 10. A plaster mold was prepared in the same manner as in Comparative Example 1 except that the hardness was lowered to 15. The defect occurrence rate when the gypsum mold is released from the rubber mold is 10 out of 10 times, and when the gypsum mold is produced several times, the bone portion separating the blocks A and B in the plaster mold produced thereafter is about 10 times. A swell of 1-2 mm occurred.

[0040]

Effect of the Invention In the method for producing a tire molding die of the present invention, in the step of producing a gypsum mold, a reinforcing material is embedded in a predetermined portion of the gypsum mold, so that gypsum at the time of releasing from the rubber mold is used. The loss of the mold can be prevented without lowering production efficiency, work efficiency and dimensional accuracy, and without changing the design of the tire.

In the method of the present invention, by embedding the reinforcing material using the fine bone as a scaffold, it is not necessary to modify and finish the gypsum mold or the mold, thereby improving the production efficiency. In addition, a pin-shaped material is used as a reinforcing material, or a pin-shaped member attached to one end of a plate-shaped reinforcing material is embedded in a rubber mold to prepare a gypsum mold, and the casting is performed without removing the reinforcing material from the gypsum mold. If you do, the hole formed in the mold,
Since it can be used as a guide hole for installing a vent hole, a welding step is not required, and production efficiency can be improved. That is, the present invention greatly contributes to the tire industry in that the manufacturing limit of the tire molding die can be expanded.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a mode of installing a reinforcing material on a rubber mold in a method of manufacturing a tire molding die of the present invention.

FIG. 2 is a process chart showing an example of a method for manufacturing a tire molding die of the present invention.

FIG. 3 is a schematic cross-sectional view showing another example of a mode of installing a reinforcing material on a rubber mold in the method of manufacturing a tire molding die of the present invention.

FIGS. 4A and 4B are schematic diagrams showing (a) an example and (b) another example of the shape of a pin-shaped member attached to a reinforcing member.

FIG. 5 is a process chart showing another example of the method for manufacturing a tire molding die of the present invention.

FIG. 6 is a perspective view showing an example of a reinforcing material used in the method of manufacturing a tire molding die of the present invention.

FIG. 7 is a schematic view showing another example of a reinforcing material used in the method for manufacturing a tire molding die of the present invention.

FIG. 8 is a schematic cross-sectional view showing still another example of a mode of installing a reinforcing material on a rubber mold in the method of manufacturing a tire molding die of the present invention.

FIG. 9 is a schematic view showing still another example of a reinforcing material used in the method for manufacturing a tire molding die of the present invention.

FIG. 10 is a schematic view showing still another example of a reinforcing material used in the method for manufacturing a tire molding die of the present invention.

FIG. 11 is a schematic view showing an example of a tire design.

FIG. 12 is a schematic view showing another example of a tire design.

FIG. 13 shows an example of a mode of attaching a reinforcing material to a fine bone in a method of manufacturing a tire molding die of the present invention (a).
It is the (c) top view and (d) perspective view which show the top view, (b) perspective view, and another example of the mode of attaching the reinforcing material to the fine bone in the manufacturing method of the tire molding die of the present invention.

FIG. 14 is a perspective view showing an example of a vertically integrated tire molding die.

FIG. 15 is a cross-sectional view illustrating an example of an upper and lower split type tire molding die.

FIG. 16 is a process diagram showing an example of a conventional method of manufacturing a vertically integrated tire molding die.

FIG. 17 is a schematic diagram showing types of grooves provided in the tire.

FIG. 18 is a process diagram showing an example of a conventional method of manufacturing a tire molding die having a vertically integrated fine bone.

FIG. 19 is a schematic cross-sectional view showing an example of a defect generated in a gypsum mold at the time of release from a rubber mold.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mold for tire molding, 2 ... Each block which comprises a mold for tire molding, 3 ... Molding space, 4 ... Plaster mold, 5 ... Cast frame, 6 ... Molten aluminum alloy, 7 ... Mold fixing material, 8
... tires, 9 ... ribs, 10 ... lugs, 11 ... sipes, 12
... fine bone, 13 ... rubber mold, 14 ... gypsum, 15 ... part of fine bone embedded in the mold body, 16 ... feeder, 18 ... mold body, 30 ... slit, 33 ... through hole, 35 ... reinforcing material , 3
6 ... projections provided on the rubber mold, 37 ... holes formed by the reinforcing material, 38 ... holes formed by the portion of the reinforcing material exposed from the gypsum mold, 39 ... welding weld, 40 ... tire molding die Provided projections, 41: pin-shaped member, 42: small diameter portion, 43: block, 44: master model, 45
... Cast-in charges.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 30:00

Claims (10)

[Claims] 1. A method of manufacturing a tire molding die by a gypsum casting method, wherein in a step of casting a gypsum into a rubber mold to produce a gypsum mold, a projection provided on the rubber mold corresponding to a groove of the tire is formed. Manufacturing a tire-forming mold, wherein a plate-shaped, pin-shaped or corrugated reinforcing material is buried in a portion of a plaster mold sandwiched between the gypsum mold and the projection substantially parallel to the projection and deeper than the projection. Method. 2. An end of the reinforcing material is embedded in the rubber mold while exposing a portion of the reinforcing material embedded in the gypsum mold, and the gypsum is poured into the rubber mold and solidified, and then the rubber is cured. 2. A gypsum mold is prepared by removing a mold and the reinforcing material and filling a hole formed by the reinforcing material by pouring gypsum.
3. The method for producing a tire molding die according to item 1. 3. An end of the reinforcing material is embedded in the rubber mold with a portion of the reinforcing material embedded in the gypsum mold being exposed, and the gypsum is poured into the rubber mold and solidified, and then the rubber is cured. After removing only the mold to prepare a gypsum mold, casting a cast of aluminum alloy melt into the gypsum mold, and welding a hole formed by a portion of the reinforcing material exposed from the gypsum mold. The method for producing a tire molding die according to claim 1, wherein the mold is filled. 4. A pin-shaped member attached to one end of a pin-shaped reinforcing member or one end of a plate-shaped reinforcing member is embedded in the rubber mold.
4. A hole formed by a portion of the reinforcing material exposed from the gypsum mold is used as a guide hole for setting a vent hole.
3. The method for producing a tire molding die according to item 1. 5. A gypsum mold is prepared by attaching the reinforcing material to a portion of the fine bone for forming a sipe that is exposed from the rubber mold, pouring gypsum into the rubber mold, and further adding aluminum to the gypsum mold. The method according to claim 1, wherein the reinforcing material is removed from the fine bone after casting by casting a molten alloy. 6. The method according to claim 5, wherein the reinforcing material is attached to the fine bone by bonding. 7. The reinforcing member has a U-shape or a U-shape, one end of which is attached to the fine bone, and the other end is sandwiched by the projection having the fine bone. The method for producing a tire molding die according to claim 5, wherein a portion different from the portion of the plaster mold is reinforced. 8. The tire molding die according to claim 1, wherein a depth at which the reinforcing material is cast into the gypsum mold is 1.5 to 5 times the length of the projection. Manufacturing method. 9. The plate-shaped or corrugated-plate-shaped reinforcing material has one or more through holes in a portion to be cast into a gypsum mold, or is oriented parallel to a projection provided on the rubber mold. 1 on the side
The method for producing a tire molding die according to any one of claims 3 to 8, which has two or more slits. 10. The tire molding according to claim 3, wherein the pin-shaped reinforcing material has at least one portion having a diameter larger than that of the other portion in a portion to be cast into the gypsum mold. Manufacturing method of metal mold.